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After developers and IT pros pelted Microsoft with complaints, the company has backtracked and decided to grant them access to the latest Windows 8.1 build instead of making them wait until mid-October.

When Microsoft sent to PC and tablet makers two weeks ago the latest pre-release version of Windows 8.1 -- the so-called RTM (release to manufacturers) build -- it broke with tradition and kept developers and IT pros out of the loop, enraging them.

Microsoft said at the time that these two camps would get access to the final version of Windows 8.1 when it starts shipping commercially on Oct. 17 and Oct. 18.

It justified the incendiary decision by saying that it had to collaborate closer than ever with its hardware partners because the OS has to work with a much broader variety of devices.

"As such, we've had to evolve the way we develop and the time in which we deliver to meet customers with the experience they need, want and expect," Microsoft official Antoine Leblond wrote two weeks ago in the blog post announcing Windows 8.1 RTM.

But in blog comments, Twitter messages and other social media channels, developers and IT pros growled, saying that this wouldn't give them time to test their applications, tools and IT environments, possibly causing chaos for them.

"How are IT pros and partners supposed to evaluate 8.1 now and perhaps change scripts/applications/whatever as needed?," wrote one person in a comment to Leblond's blog post.

On Monday, in a surprise reversal, Microsoft announced that it has changed its mind, and that subscribers to MSDN (Microsoft Developer Network) and TechNet now have access to Windows 8.1 RTM.

They get to download both the Pro and standard editions of Windows 8.1 RTM, as well as Windows Server 2012 R2 RTM and Visual Studio 2013 Release Candidate.

However, they will not get access to the RTM version of Windows RT 8.1, the version of the OS for devices that run ARM chips, according to a Microsoft spokesman. Hardware vendors did get access to Windows RT 8.1 RTM two weeks ago.

In a blog post on Monday, Microsoft said it will still be necessary for IT pros and developers to refine and tweak their Windows 8.1 applications and IT environments once the final, GA (general availability) version of the OS ships in mid-October.

However, the RTM version offers code that is much closer to the final build than the Preview version developers and IT pros received in late June at Microsoft's Build conference.

Microsoft had argued in its defense two weeks ago that the Preview versions of Windows 8.1 and Visual Studio were sufficiently baked for the purposes of IT pros and developers.

This was the latest flap involving Windows 8, a historically important upgrade to the company's flagship OS for desktops, laptops and tablets.

Windows 8 started shipping October of last year with a radically altered user interface called Modern, and also with a more traditional Windows 7-like desktop for legacy applications.

Based on tile icons and optimized for touchscreen devices, the Modern interface was designed to make Windows a better OS for tablets, where the Microsoft OS has taken a beating at the hands of Android and Apple's iOS.

Unfortunately, the Modern interface wasn't well received, particularly among enterprise and consumer buyers of Windows 8 laptops and desktops, who complained that it was hard to master and inconvenient to use with a mouse and keyboard.

With Windows 8.1, Microsoft is hoping to put out the main fires keeping customers away from the OS. For instance, it's adding something very close to the Windows 7 Start button, which the company took away in Windows 8, clearly unaware of how attached users are to it.

Windows 8.1 also attempts to smooth out the process of toggling between the Modern and traditional interfaces, which many users have described as awkward. To this end, it will be possible for Windows 8.1 users to boot directly to the traditional desktop interface.

Windows 8.1 also lets users view all the applications installed on their device and sort them by name, date installed, most used or category. The OS update also sports an improved search engine powered by Bing that will return results from a variety of sources, including the Web, applications, local files and the SkyDrive cloud storage service.

Windows 8.1 also comes with Internet Explorer 11, a new version of Microsoft's browser that the company has said will load pages faster and offer better performance in touchscreen mode.

Other Windows 8.1 enhancements include the ability to make a Skype call and take photos with the Windows 8.1 device while the screen is in Lock mode without having to log in. It will be possible as well for users to select multiple applications at once and perform bulk actions on them, like resizing, uninstalling and rearranging them.